diff --git a/libavcodec/riscv/lpc_init.c b/libavcodec/riscv/lpc_init.c
index ab91956f2d..08efae4da7 100644
--- a/libavcodec/riscv/lpc_init.c
+++ b/libavcodec/riscv/lpc_init.c
@@ -36,7 +36,7 @@ av_cold void ff_lpc_init_riscv(LPCContext *c)
     if ((flags & AV_CPU_FLAG_RVV_F64) && (flags & AV_CPU_FLAG_RVB_ADDR)) {
         c->lpc_apply_welch_window = ff_lpc_apply_welch_window_rvv;
 
-        if (ff_get_rv_vlenb() >= c->max_order)
+        if (ff_get_rv_vlenb() > c->max_order)
             c->lpc_compute_autocorr = ff_lpc_compute_autocorr_rvv;
     }
 #endif
diff --git a/libavcodec/riscv/lpc_rvv.S b/libavcodec/riscv/lpc_rvv.S
index d4ea515fee..3fdf80ebed 100644
--- a/libavcodec/riscv/lpc_rvv.S
+++ b/libavcodec/riscv/lpc_rvv.S
@@ -87,6 +87,7 @@ func ff_lpc_apply_welch_window_rvv, zve64d
 endfunc
 
 func ff_lpc_compute_autocorr_rvv, zve64d
+        addi      a2, a2, 1
         li        t0, 1
         vsetvli   zero, a2, e64, m8, ta, ma
         fcvt.d.l  ft0, t0